Spike tooth harrow



Dec. 8, 1931. J v. DYRR SPIKE TOOTH HARROW Filed Dec. 26, 1928 Patented Dec. 8, 1931 i i i v U-ETED' {STATES PATENT f JAcoB v. an-on semi, CALIFORNIA I SPIKE TOOTH ma row Application filed December 26,1928. Serial No. 328,514.

object of the inve'ntionis to provide Ghe apness and simplicity,',and ease ofa-p more eflective means for fastening and ad-* plying and removing thetooth are further justing the spike harrow teeth to the cross-f objects'of the invention.

V barof the harrow. v V Another feature of the invention-resides in The invention ,is applicable to various providing the spike tooth withrecesses to 5. formsof "cross-bars, such as channel irons, engage the space-separated frictional seats so angle irons or metal tubes, the principle of thatwhen'th e key is driven home,the tooth the invention being that I provide the bar iswedged in pla'ce'with itsnotches'en'gaging with a spike tooth support having seats at the Spaced apartfrictional spike seats of the its opposite sides spaced apart to seat the crossbar; 60

tooth at "two 'open-space-separated places o In thepreferredconstruction theteeth are along its length and provide a key, Outside square in cross section and the key has an of which is adapted toiengage one side of the angular channel to fit on one corner or edge tohth, and the other side of which; is provided of the tooth,-and the opposite corneror edge with two inclined faces for contact with the of the tooth is'notohed to fit onto the-tooth 65 cross-bar open-space-separated seats on opseats formed by thetedgesof the-two holes posite sides of the axis thereof, so that the 1n the cross bar." v seating of the spike tooth in the open-space The inventioninoludes the assembly and Y separated seats therefor maybe, uniform and parts and combinations hereinafter set forth' so that the key will fit tightly between the and C mdt g tootlfandthe seats on the opposite sides'of An object is insurance against accidental the bar thus to give a doublepurchase for loos nlngof the teeth, andea'se of ca'pplying, the tooth and prevent any looseness orlost TG D V i gQand replacing the teeth; A motion. v a f Anob1ect is'to facilitate theremovalof the Preferably I employ a gas pipe of suitable keys, and to guard against injuringbr pre- 75 diameter for the cross-bar, and the seats are mature destruction thereof in'thecourse of made by boringthrough the crossbar atsuit removal, able intervals, holes of one diameter'so that Other objects, advantages andfeaturesjof there are ateach boringfiwo separated seats invention may appearrfro'm' thelaccom'panyon which the spike tooth will rest, and there 111g drawings, the'suhjbine'd detaileddescripj are thus provided two purchases against t OIi a d the appended claims.

which the two wedges of the key will act to Thef3 P$1yiIlg drawings wedge the tooth onto the two seats on the the-invention. a v b c opposite sides of the crossbar. I thus pro- E'Figureli's a perspective view illustrating 35 vide in the crossbar at each hole two sets the invention'fg f li d flfh l ir end 35 of open space-separated seats and thus inofth f g f i 't tHha dwh crease the frictional bearings for each tooth i o h b i fiad f a i' ,f p and s Wedge F .2 is a detail of the devic'eiwith the I In lieu of the preferred constructlon hav- Cross bar in sectioning the plane indicated 9 to lug opposite holes of the same dlameter, the line F1 4 v I T 0 bar may be provided with holes of different i a diameters so that a wedge, the faces of which k elspec T w v Q" up ex are straight from end to end of the wedge, g 6 i :j. a may be employed, care being taken that the 41S x t i' e f n r relative angularity of the faces is such that 9 f Pl n lndlcated b when the wedge is driven home at the side a .2 P q 7 i of the tooth, it will fit tightly;both the wedge g- 15 1S a detail w g l y,' and the tooth being in frictional contact with well as the crossbar in section 0n-'linem 2 }ac5, open-space-separated seats for such elements Figt4nj 5 00 tiv ly, Fig. 6 is a viewanalogousto Figi5show ing the form in which the external face of the key is longitudinally straight.

Fig. 7 is a View of an angle iron cross bar provided with a tooth seated in accordance with this invention.

Fig. 8 is a transverse section of a channel iron bar provided with my improvement.

The transverse hollow cylindrical harrow tooth-bar 1 is rigidly and non-rotatably \onnected to arms 2 by which the tooth bar is rigidly fixed to the main harrow frame 3. 4: indicates circular holes through the tooth bar, providing open-space-separated tooth engaging seats as at 5 and 5, against one side of which the harrow spike tooth 6 will rest when such tooth is in operative position as in Figs. 1, 2, 5, 6, 7, 8.

The harrow spike tooth is shown as main: 1y rectangular in cross section and is provided in one of its longitudinalangles a with notches 7 that are spaced apart in conformity with the spaces between the seats 5, 5 formed at the edges of the bar 2 by the holes 4, through the bar, and with the exception of such notches, is smooth and straight from the heel to the usual point.

The preferred means to secure the tooth in its seat is a channelled double wedge key 8 driven home, to fit friction tight between the space-separated seats of one side of the hole in the bar and the straight edge Z) of the spike tooth, opposite the notched angle a. The notches 7 engaging the separated seats insure against the parts becoming loose or falling out when the wedges are in place.

Thechannel 9 of the key is conformed to a corner and two adjacent faces of the peg tooth, and the outer face of the key is transversely arcuate, and longitudinally stepped with wedge-like faces to simultaneously wedge against the two seats on one side of the hole, thus forcing the peg tooth against the seats therefor. v The smaller end of the double wedge 8 is provided with a reinforcement in the form of a flange or a bead 10, thus to afiord a suitable head which may be struck by a hammer or other instrument in the operation of loosening the wedge from the tooth. The large ends 11 and 12 of the wedges serve a like purpose for driving the wedge in the operation of tightening the tooth.

In Fig. 6 the holes 4 and 4 are of different diameters so that when the straight wedge key 8 is driven home it will engage the edges of the two holes, thus to secure the tooth in place.

In Fig. 7, 13 indicates an angle bar employed in place of the cylindrical bar 1; and in Fig. 8, 14 indicates a channel bar adapted to alike purpose. Each of the bars, however, has holes as above described, affording at each hole two sets of seats, there being in each instance two seats for each tooth, and two seats for each wedge.

I claim 1. The combination with a harrow crossbar having a transverse opening provided with seats spaced apart at opposite sides of the cross-bar; a peg extending through the opening and engaging the seats, and a wedge key adapted to engage the seats respectively to force the tooth into contact with the opposite edges of the opening.

2. The combination with a cross-bar, havi11 a transverse opening provided with seats at opposite edges of the cross-bar; a spike tooth having notches along one side to engage the seats in the opening and a wedge key adapted to force the tooth onto the seats.

3. The combination with a harrow cross bar having a transverse opening provided with seats spaced apart at opposite sides of the cross-bar; a spike tooth extending through the opening and engaging the seats, and a wedging key adapted to engage the seats respectively to force the tooth into contact with the opposite edges of the opening.

4. The combination of a hollow cylindrical harrow cross-bar having a transverse opening provided with seats spaced apart at opposite sides of the cross-bar; a spike tooth extending through the opening and engaging the seats, and a wedge key adapted to engage the seats respectively to force the tooth into contact with the opposite edges of the opening.

5. The combination of a cylindrical harrow cross-bar having a transverse opening provided with seats spaced apart at opposite sides of the crossbar; a spike tooth extending through the opening and engaging the seats, and a wedge key adapted to engage the seats respectively to force the tooth into contact with the opposite edges of the opening.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 4th day of December, 1928.

. JACOB V. DYRR. 

